CN110385546A - A kind of the X80 pipe line steel submerged-arc welding flux-cored wire and preparation method of good low temperature performance - Google Patents
A kind of the X80 pipe line steel submerged-arc welding flux-cored wire and preparation method of good low temperature performance Download PDFInfo
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- CN110385546A CN110385546A CN201910672191.9A CN201910672191A CN110385546A CN 110385546 A CN110385546 A CN 110385546A CN 201910672191 A CN201910672191 A CN 201910672191A CN 110385546 A CN110385546 A CN 110385546A
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- cored wire
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
- B23K35/0261—Rods, electrodes, wires
- B23K35/0266—Rods, electrodes, wires flux-cored
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/3073—Fe as the principal constituent with Mn as next major constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
- B23K35/406—Filled tubular wire or rods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
Abstract
The invention discloses the X80 pipe line steel submerged-arc welding flux-cored wires and preparation method of a kind of good low temperature performance, flux-cored wire includes medicine core and weldering skin, and wherein medicine core is composed of the following components by mass percentage: manganese 1.3%-2.6%, silicon 0.1%-0.3%, molybdenum 0.3%-0.5%, nickel 1.1%-1.5%, boron 0.005%-0.01%, copper 0.01%-0.04%, titanium 0.003%-0.008%, ceria 0.1%-0.25%, remaining is iron, and the sum of above constituent mass percentage is 100%.Beneficial effects of the present invention: the elements such as Ni, Mn, Mo are added by burden control, have obtained a kind of welding point deposited metal composition for being similar to X80 pipe line steel base material；Face of weld is bright and clean, has metallic luster, pore-free is without slag inclusion；And ballistic work Akv at -45 DEG C‑45℃>=105J is suitable for -45 DEG C of operating conditions.
Description
Technical field
The invention belongs to technical field of welding materials, and in particular to a kind of X80 pipe line steel submerged-arc welding of good low temperature performance
Flux-cored wire, the invention further relates to the preparation methods of the welding wire.
Background technique
X80 pipe line steel is the super-steel of crystallite dimension in the micron-scale, the chemical component of the steel are as follows: C≤0.22%, Si≤
0.40%, Mn≤1.85%, P≤0.030%, S≤0.018%, (Nb+V+Ti)≤0.5% by molten iron pretreatment, turn
The multisteps New Metallurgical Techniques such as furnace refining, ladle metallurgy and continuous casting and controlled rolling and controlled cooling (TMCP) milling method obtain, and have ultra-clean
The characteristics of degree, super uniformity and superfine grained structure.
X80 pipe line steel using Ultra-low carbon acicular ferrite as tissue signature, component of weld wire design it is upper generally using low-carbon (C <
0.06%) based on Mn-Ni-Mo-Ti-B alloy system, the content by improving Mn is made up under yield strength caused by reducing C
Drop, and the strong carbon, nitride (M (CN), BN) such as add tiny alloying element Ti, B, to prevent austenite crystal grain length in During Controlled Rolling
Greatly, and postpone the recrystallization of austenite in the operation of rolling.In addition, further appropriate addition Ni, Mo, Cu element strengthens matrix.Add
After entering light rare earth elements Ce, Ce can be enriched in silicate inclusion, make inclusion balling, be conducive to the shape of acicular ferrite
Core.Ensure required for acicular ferrite structure on the basis of, in conjunction in process for making use ultralow S, P field trash
The smelting Technology for Clean Steel of form control and the hot rolling technology of controlled rolling and controlled cooling.By the best fit of ingredient and technique, had
There are high intensity, high tenacity, low Bauschinger effect and good welds performance, while there is high ductile fracture arrest performance.
X80 pipe line steel can obtain high obdurability by thinning microstructure, but weld seam only is completed to refine by alloying
The purpose of product grain, it is therefore necessary to develop matched welding material, can just obtain the welded tube of high-strength tenacity.
Summary of the invention
The object of the present invention is to provide a kind of X80 pipe line steel submerged-arc welding flux-cored wire of good low temperature performance, solve existing
Welding Pipe Toughness after the welding of some X80 pipe line steel submerged-arc welding flux-cored wires is high, the inaesthetic problem of weld seam.
It is a further object to provide a kind of X80 pipe line steel submerged-arc welding flux-cored wires of good low temperature performance
Preparation method.
The technical scheme adopted by the invention is that a kind of X80 pipe line steel submerged-arc welding flux-cored wire of good low temperature performance,
Including medicine core and weldering skin, medicine core be wrapped in weldering it is intradermal, wherein medicine core is composed of the following components by mass percentage: manganese 1.3%-
2.6%, silicon 0.1%-0.3%, molybdenum 0.3%-0.5%, nickel 1.1%-1.5%, boron 0.005%-0.01%, copper 0.01%-
0.04%, titanium 0.003%-0.008%, ceria 0.1%-0.25%, remaining is iron powder, the above constituent mass percentage
The sum of be 100%.
The features of the present invention also characterized in that:
The powder granularity of medicine core is 80~120 mesh.
Weldering skin is mild steel steel band, the quality of mass percent≤0.035%, S element of P element in mild steel steel band
Percentage≤0.03%.
Second technical solution of the present invention is a kind of X80 pipe line steel submerged-arc welding medicine core of good low temperature performance
The preparation method of welding wire, the specific steps are as follows:
Step 1, it weighs respectively by mass percentage: manganese 1.3%-2.6%, silicon 0.1%-0.3%, molybdenum 0.3%-
0.5%, nickel 1.1%-1.5%, boron 0.005%-0.01%, copper 0.01%-0.04%, titanium 0.003%-0.008%, titanium dioxide
Cerium 0.1%-0.25%, remaining is iron powder, and the sum of above constituent mass percentage is 100%, obtains medicine core powder；
Step 2, the medicine core powder obtained with mild steel steel band package step 1, and be closed steel band with molding machine, use wine
Smart wiped clean carries out drawing again, is drawn to the flux-cored wire of required diameter.
The features of the present invention also characterized in that:
The diameter of flux-cored wire is 3.2mm or 4mm in step 2.
The width of step 2 middle low carbon steel steel band is 30mm, thickness 0.5mm.
The beneficial effects of the present invention are: being obtained by the control of the elements such as Ni, Mn, Mo proportion and the addition of microelement
A kind of welding point deposited metal composition being similar to X80 pipe line steel base material；Face of weld is bright and clean, has metallic luster, nothing
Stomata is without slag inclusion；Ballistic work Akv at -45 DEG C of deposited metal of flux-cored wire welding point-45℃>=105J, so that this welding wire is suitble to
In -45 DEG C of operating conditions.
Detailed description of the invention
Fig. 1 is a kind of X80 pipe line steel submerged-arc welding flux-cored wire welding X80 pipe line steel of good low temperature performance of the present invention
Welding point figure.
Specific embodiment
The following describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
A kind of X80 pipe line steel submerged-arc welding flux-cored wire of good low temperature performance of the invention, the powder medicine core of flux-cored wire
Include following component according to mass percent: wherein medicine core is composed of the following components by mass percentage: manganese 1.3%-2.6%,
Silicon 0.1%-0.3%, molybdenum 0.3%-0.5%, nickel 1.1%-1.5%, boron 0.005%-0.01%, copper 0.01%-0.04%,
Titanium 0.003%-0.008%, ceria 0.1%-0.25%, remaining is iron powder, and the sum of above constituent mass percentage is
100%.
Weldering skin is mild steel steel band, the quality of mass percent≤0.035%, S element of P element in mild steel steel band
Percentage≤0.03%.
Molybdenum element comes from molybdenum-iron powder, and wherein the mass percent of Mo is 55%~60%, C≤0.1%, remaining is Fe；Institute
Molybdenum element is stated from ferrosilicon powder, wherein the mass percent of Si is 40%-45%, remaining is Fe.
A kind of X80 pipe line steel submerged-arc welding flux-cored wire preparation method of good low temperature performance of the present invention, specifically includes as follows
Step:
Step 1, it matches the medicine core powder of flux-cored wire and is uniformly mixed, medicine core powder includes such as according to mass percent
Lower component: manganese 1.3%-2.6%, silicon 0.1%-0.3%, molybdenum 0.3%-0.5%, nickel 1.1%-1.5%, boron 0.005%-
0.01%, copper 0.01%-0.04%, titanium 0.003%-0.008%, ceria 0.1%-0.25%, remaining is iron powder, with
The sum of upper constituent mass percentage is 100%.
Step 2: the weighed medicine core powder of step 1 being uniformly mixed, with width is 30mm, the mild steel steel of thickness 0.5mm
Band package, and be closed steel band with molding machine, drawing is completely carried out again with alcohol wipe, and being drawn to diameter is 3.2mm or 4mm
Flux-cored wire.
Welding condition when X80 pipe line steel is welded using the flux-cored wire of preparation, welding current is 600~750A, welding
Voltage is 33.5~38.5V, electrode extension 28mm, submerged arc welding flux SJ101G3.
Main component is played a role in a kind of X80 pipe line steel submerged-arc welding flux-cored wire of good low temperature performance of the present invention
It is as follows respectively:
Silicon, it is main deoxidier that Si deoxidizing capacity ratio Mn is strong, can eliminate FeO and be mingled with adverse effect to steel.Si energy
It is acted on FeO and forms SiO2, it is excluded subsequently into clinker.Si is in addition to forming SiO2As impurity be present in steel with
Outside, Si is mainly dissolved in ferrite at room temperature, therefore Si has invigoration effect to steel；
Manganese, Mn are among the austenite stabilizing elements, and the addition of manganese can significantly reduce austenite that structural transformation is to ferrite
The temperature of transformation.Meanwhile manganese effect in terms of reducing brittle transition temperature is obvious.There are also certain deoxidations to take off for manganese in medicine core
Sulphur effect, can generate manganese oxide, and stable manganese sulfide can also be generated with reaction of Salmon-Saxl in conjunction with manganese, be reduced with this
The generation of low melting point phase iron sulfide in weld seam improves the heat resistanceheat resistant crackle ability of weld metal；
Copper, Cu are to reduce γ phase transition temperature element, increase the stability of overcooling austenite, reduce Ms point.The study found that
When Cu content is in 0.03%~0.89% range in weld seam, with the increase of Cu content, AF quantity is reduced, grain boundary ferrite
Quantity increases, crystal grain refinement.Actually the main function of Cu is for improving weather-resistant, so-called weather-resistant
Refer to the ability that atmospheric corrosion is resisted when steel member or container use in the natural environment, and Cu is one of most effective element；
Titanium, Ti are the elements for reducing γ phase region, are strong deoxidier and Ti (C, N) formation element, these high melting compounds
Particle can be used as crystallization nuclei, refine weld grain.Studies have shown that micro Ti is added in weld seam to show weld seam
Micro-assembly robot and mechanical property generate surprising variation, and when Ti content is up to 0.001% in weld metal, microscopic structure will be from 80%
Ferrite side plate become 60% AF.Non-metallic inclusion SiO in weld seam2Since the increase of Ti content is gradually by TiO generation
It replaces.Addition and the high Ti of N affinity, on the one hand can reduce the content of free N in weld metal in weld metal, another side
Ti (C.N), the TiO fire inclusion particles of face generation can promote the forming core of AF in austenite crystal；
Boron, B can obviously inhibit forming core of the ferrite on austenite grain boundary, move to right ferritic transformation curve obviously, together
When so that bainite transformation curve is become flat, bainite structure can be obtained in biggish cooling range.Research shows that: with
The increase of B content in weld seam, the proeutectoid ferrite scale of construction are reduced, and ferrite side plate disappears, and AF amount increases, to obtain tiny
Microstructure of Weld Metal；
Nickel, Ni can be completely dissolved in austenite, and in welding High-temperature cooling process, Ni can substantially reduce austenite
Transition temperature, low phase transition temperature can guarantee the precipitation of uniformly tiny acicular ferrite, inhibit blocky proeutectoid ferrite
The formation of body is conducive to improve welding seam toughness；
Molybdenum, Mo can reduce austenite phase field, and austenite is solid-solution in weld seam or is deposited in the form of strong carbon compound
Pro-eutectoid ferrite transformation can postponed and advantageously forming bainite structure, a small amount of Mo, which is added, will make deposited metal
Intensity greatly improve but also toughness can be improved.The combination of Mo-Ti can more optimize seam organization after addition trace Ti, make
The tissue of weld seam is more uniform, and impact flexibility is improved significantly；
Cerium, rare earth element ce played in weld metal purification impurity, it is rotten be mingled with and Microalloying Effect, rename
It is to be conducive to improve toughness plasticity, can integrate the strengthening effect for playing Mo, T, B and Ce improves the effect for cutting plasticity.Research shows that light
Rare earth element is added after weld seam, can be enriched in silicate inclusion, make inclusion balling, and be distributed with disperse state, from
And be conducive to the forming core of AF, it is suppressed that PF refines seam organization.
Embodiment 1
Step 1: flux-cored wire is prepared by following mass percent, manganese 1.3%, silicon 0.3%, molybdenum 0.4%, nickel 1.1%,
Boron 0.006%, copper 0.025%, titanium 0.004%, ceria 0.1%, remaining is iron powder, the above constituent mass percentage it
Be 100%；
Step 2: selection width is 30mm, the mild steel steel band of thickness 0.5mm wraps up medicine core powder, and will with molding machine
Mild steel steel band closure, completely carries out drawing with alcohol wipe again, and being drawn to diameter is 3.2mm.
Flux-cored wire made from embodiment 1 is used for submerged-arc welding (SAW).Welding condition are as follows: welding current 750A, weldering
Connecing voltage is 36V, electrode extension 28mm, submerged arc welding flux SJ101G3.
After tested, -45 DEG C of ballistic works are 110J, and the quality percentage for the welding point deposited metals element being prepared is shown in
Table 1.
Embodiment 2
Step 1: flux-cored wire is prepared by following mass percent, manganese 2.0%, silicon 0.1%, molybdenum 0.3%, nickel 1.2%,
Boron 0.007%, copper 0.01%, titanium 0.005%, ceria 0.2%, remaining is iron powder, the sum of above constituent mass percentage
It is 100%；
Step 2: selection width is 30mm, the mild steel steel band of thickness 0.5mm wraps up medicine core powder, and will with molding machine
Mild steel steel band closure, completely carries out drawing with alcohol wipe again, and being drawn to diameter is 3.2mm.
Flux-cored wire made from embodiment 2 is used for submerged-arc welding (SAW).Welding condition are as follows: welding current 680A, weldering
Connecing voltage is 38V, electrode extension 28mm, submerged arc welding flux SJ101G3.
After tested, -45 DEG C of ballistic works are 105J, and the quality percentage for the welding point deposited metals element being prepared is shown in
Table 1.
Embodiment 3
Step 1: preparing flux-cored wire, manganese 2.6%, silicon 0.21%, molybdenum 0.33%, nickel by following mass percent
1.3%, boron 0.01%, copper 0.03%, powder 0.003%, ceria 0.15%, remaining is iron powder, the above constituent mass percentage
Than the sum of be 100%；
Step 2: selection width is 30mm, the mild steel steel band of thickness 0.5mm wraps up medicine core powder, and will with molding machine
Mild steel steel band closure, completely carries out drawing with alcohol wipe again, and being drawn to diameter is 3.2mm；
Flux-cored wire made from embodiment 3 is used for submerged-arc welding (SAW).Welding condition are as follows: welding current 650A, weldering
It is 28mm, submerged arc welding flux SJ101G3 that connect voltage, which be 33.5V electrode extension,.
After tested, -45 DEG C of ballistic works are 115J, and the quality percentage for the welding point deposited metals element being prepared is shown in
Table 1.
Embodiment 4
Step 1: flux-cored wire is prepared by following mass percent, manganese 2.3%, silicon 0.15%, molybdenum 0.5%, nickel 1.4%,
Boron 0.005%, copper 0.04%, titanium 0.006%, ceria 0.25%, remaining is iron powder, the above constituent mass percentage it
Be 100%；
Step 2: selection width is 30mm, the mild steel steel band of thickness 0.5mm wraps up medicine core powder, and will with molding machine
Mild steel steel band closure, completely carries out drawing with alcohol wipe again, and being drawn to diameter is 3.2mm.
Flux-cored wire made from embodiment 4 is suitable for submerged-arc welding (SAW).Welding condition are as follows: welding current 750A,
Weldingvoltage is 36V, electrode extension 28mm, submerged arc welding flux SJ101G3.
After tested, -45 DEG C of ballistic works are 155J, and the quality percentage for the welding point deposited metals element being prepared is shown in
Table 1.
Embodiment 5
Step 1: preparing flux-cored wire, manganese 1.6%, silicon 0.25%, molybdenum 0.45%, nickel by following mass percent
1.5%, boron 0.008%, copper 0.035%, titanium 0.008%, ceria 0.18%, remaining is iron powder, the above constituent mass hundred
Dividing the sum of ratio is 100%；
Step 2: selection width is 30mm, the mild steel steel band of thickness 0.5mm wraps up medicine core powder, and will with molding machine
Mild steel steel band closure, completely carries out drawing with alcohol wipe again, and being drawn to diameter is 3.2mm.
Flux-cored wire made from embodiment 5 is suitable for submerged-arc welding (SAW).Welding condition are as follows: welding current 600A,
Weldingvoltage is 38.5V, electrode extension 28mm, submerged arc welding flux SJ101G3.
After tested, -45 DEG C of ballistic works are 136J, and the quality percentage for the welding point deposited metals element being prepared is shown in
Table 1.
The chemical component (unit: wt.%) of welding point deposited metal in 1 embodiment 1-5 of table
| C | Mn | Si | Mo | Ni | Ti | B | Cu | Ce | P | S | N | |
| Embodiment 1 | 0.046 | 1.3 | 0.30 | 0.40 | 1.10 | 0.005 | 0.0020 | 0.20 | 0.020 | 0.005 | 0.008 | 0.017 |
| Embodiment 2 | 0.050 | 1.4 | 0.50 | 0.30 | 1.15 | 0.008 | 0.0022 | 0.10 | 0.023 | 0.006 | 0.009 | 0.009 |
| Embodiment 3 | 0.056 | 1.4 | 0.40 | 0.50 | 1.20 | 0.007 | 0.0030 | 0.13 | 0.040 | 0.007 | 0.008 | 0.013 |
| Embodiment 4 | 0.063 | 1.6 | 0.35 | 0.45 | 1.30 | 0.010 | 0.0035 | 0.24 | 0.050 | 0.006 | 0.007 | 0.015 |
| Embodiment 5 | 0.070 | 1.5 | 0.45 | 0.60 | 1.23 | 0.015 | 0.0040 | 0.30 | 0.032 | 0.006 | 0.009 | 0.014 |
The chemical component of X80 pipe line steel are as follows: C≤0.22%, Si≤0.40%, Mn≤1.85%, P≤0.030%, S≤
0.018%, (Nb+V+Ti)≤0.5%, remaining is Fe；As shown in Table 1, it is welded using submerged-arc welding flux-cored wire of the invention
Each element ingredient is similar to the chemical component of X80 pipe line steel in welding point deposited metals, matches with X80 pipe line steel base material,
Obtain the welded tube of high-strength tenacity.
X80 pipe line steel is welded by a kind of X80 pipe line steel submerged-arc welding flux-cored wire of good low temperature performance of Fig. 1 present invention
Welding point figure, it can be seen that appearance of weld is beautiful.
- 45 DEG C of ballistic work >=105J after welding, it was demonstrated that still have preferably toughness under -45 DEG C of environment.
Claims (6)
1. a kind of X80 pipe line steel submerged-arc welding flux-cored wire of good low temperature performance, which is characterized in that including medicine core and weldering skin, medicine
Core be wrapped in weldering it is intradermal, wherein medicine core is composed of the following components by mass percentage: manganese 1.3%-2.6%, silicon 0.1%-
0.3%, molybdenum 0.3%-0.5%, nickel 1.1%-1.5%, boron 0.005%-0.01%, copper 0.01%-0.04%, titanium 0.003%-
0.008%, ceria 0.1%-0.25%, remaining is iron powder, and the sum of above constituent mass percentage is 100%.
2. a kind of X80 pipe line steel submerged-arc welding flux-cored wire of good low temperature performance according to claim 1, feature exist
In the powder granularity of the medicine core is 80~120 mesh.
3. a kind of X80 pipe line steel submerged-arc welding flux-cored wire of good low temperature performance according to claim 1, feature exist
In the weldering skin is mild steel steel band, the quality hundred of mass percent≤0.035%, S element of P element in mild steel steel band
Divide ratio≤0.03%.
4. a kind of preparation method of the X80 pipe line steel submerged-arc welding flux-cored wire of good low temperature performance as described in claim 1,
It is characterized in that, steps are as follows:
Step 1, it weighs respectively by mass percentage: manganese 1.3%-2.6%, silicon 0.1%-0.3%, molybdenum 0.3%-0.5%, nickel
1.1%-1.5%, boron 0.005%-0.01%, copper 0.01%-0.04%, titanium 0.003%-0.008%, ceria 0.1%-
0.25%, remaining is iron powder, and the sum of above constituent mass percentage is 100%, obtains medicine core powder；
Step 2, the medicine core powder obtained with mild steel steel band package step 1, and be closed steel band with molding machine, use alcohol wipe
Drawing is completely carried out again, is drawn to the flux-cored wire of required diameter.
5. a kind of preparation method of the X80 pipe line steel submerged-arc welding flux-cored wire of good low temperature performance according to claim 4,
It is characterized in that, the diameter of flux-cored wire is 3.2mm or 4mm in step 2.
6. a kind of preparation method of the X80 pipe line steel submerged-arc welding flux-cored wire of good low temperature performance according to claim 4,
It is characterized in that, the width of step 2 middle low carbon steel steel band is 30mm, thickness 0.5mm.
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| CN112935630A (en) * | 2021-03-22 | 2021-06-11 | 西安理工大学 | Argon-filling-free self-protection flux-cored wire on back of stainless steel pipeline and preparation method thereof |
| CN113802046A (en) * | 2021-10-15 | 2021-12-17 | 山东钢铁股份有限公司 | Method for avoiding pore defect of welding seam of spiral submerged arc welding steel pipe |
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| CN112935630A (en) * | 2021-03-22 | 2021-06-11 | 西安理工大学 | Argon-filling-free self-protection flux-cored wire on back of stainless steel pipeline and preparation method thereof |
| CN112935630B (en) * | 2021-03-22 | 2022-07-22 | 西安理工大学 | Argon-filling-free self-protection flux-cored wire for back of stainless steel pipeline and preparation method thereof |
| CN113802046A (en) * | 2021-10-15 | 2021-12-17 | 山东钢铁股份有限公司 | Method for avoiding pore defect of welding seam of spiral submerged arc welding steel pipe |
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Application publication date: 20191029 |